Safety Integrity Level

Safety Integrity Level

Un Safety Integrity Level (SIL ou niveau de 'sécurité intégrée') est défini comme un niveau relatif de réduction de risques inhérents à une fonction de sécurité, ou comme spécification d'une cible de réduction de risque. Plus simplement, c'est une mesure de la performance attendue pour une fonction de sécurité (ou SIF).

Les exigences pour un niveau donné de SIL ne sont pas toujours cohérents entre les différentes normes traitant de sécurité. Dans les 'European Functional Safety standards', on trouve la définition de quatre SIL, allant de SIL 1 pour le moins sûr à SIL 4 pour le plus sûr (grande fiabilité). Un SIL est déterminé à partir d'un certain nombre de facteurs quantifiés dans la gestion du cycle de développement et/ou du cycle de vie.


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